Annealing furnace



2 Sheets-Sheet l /N VEN TOR G. J. HAGAN mummue FURNACE Filed July 21, 1923 March 10, 192 s.

WITNE6'SES Patented Mar. no, 1925.

UNITED GEORGE J. HAGAN, OF PERRYSVILLE, PENNSYLVANIA, ASSIGNOR T0 GEORGE 'J'.

RAG-AN COMPANY, OF PITTSBURGH. PENNSYLVANIA, A CORPORATION SYLVANIA.

OF PENN- ANNEALING FURNACE.

Application filed July 21, 1923. Serial No. 653,009.

To all whom it may concern:

Be it known that I, GEORGE J. HAGAN, residing at Perrysville, in the county of Allegheny and State of Pennsylvania, a citizen of the United States, have invented or discovered certain new and useful Improvemerits in Annealing Furnaces, of which improvements the following is a specification.

In what is termed closed annealing articles, as metal sheets, they are placed in an annealing box which is arranged on suitable supports projectingabove the hearth of the heating chamber of a furnace. As this box is of a considerable width, difliculty is experienced in heating the underside thereof and the object of the invention described herein is to provide means which may be supplemental to the main draft outlet from the oven whereby products of combustion may be caused to flow under the box, thus insuring the uniform heating thereof. ,The invention is hereinafter more fully described and claimed.-

In the accompan ing drawings forming a part of this speci cation, Fig. 1 is a plan View of an annealing furnace. embodying the improvements claimed herein; Fig. 2 is a transverse section on a plane indicated b the line IIII, Fig. 1; and Fig. 3 is a simllar view illustrating a modification of the improvement.

In the embodiment of the invention, shown in Figs. 1 and 2, the furnace is constructed with a combustion chamber 1 from which the heat and products of combustion pass over the bridge wall-2 and over the annealing box, shown in position'in the heating chamber A, and escapes through the outlet flues 3 to the conduit 4'leading to the stack. It is preferred that the-bridge wall should be rovided with openings 5 therethrough so t at the products of combustion may come directly into contact with the wall of the box adjacent to thebridge wall. While the box can be supported b any suitable means at a distance from the hearth 6 of the furnace so as to leave a s ace between the bottom of the box and t e hearth of the furnace, it is preferred to provide rails 7 having their upper sides constructed to form raceways for balls 8 on which the box will rest when charged into the furnace. When putting a box into the furnace, the balls are s aced suitable distances apart to permit of t epassage of the products of combustion between them to the underside of the box. It has been found in practice that suflicient heat does not flow in under the box to insure the proper heating of the lower part of the contents thereof. In order to insure the flow of heat and roducts of combustion laterally under tie box, a port or a series of ports or openings 9 are formed through thehearth between the supporting rails 7, and this port or these ports are'connected by a passage or passages 10 toa flue 11 leading to an auxiliary stack which is provided with a damper 12 regulating the flow of heat and products of combustion through the passage 10 and conduit 11 to the auxiliary stack. In lieu of employing a. separate or auxiliary stack and connecting the port or ports 9 thereto, such port or ports may be connected by a passage or passages 10 to the main conduit 4, as shown in Fig. 3,, and in such case the flow of products of combustion passing through this ort and passage 10 would be regulated by bricks or tiles 13 arranged to cover the port or ports 9 to a greater or less extent, as shown in Figs. 1 and 3.

While the construction shown and described -herein is primarily designed for heating articles arranged in boxes, articles such as sheets, may be arranged on the sup-v ports so that heat and products of combustion will pass under the same.

I claim herein as my invention:

1. An annealing furnace having in combination a heating chamber, means for supporting the article to be heated a suitable distance above the hearth of said chamber,

nets of combustion arranged in such relation to the ports for the entrance of the products of combustion to the heating chamber that such products of combustion will flow across the heating chamber and down one side thereof, auxilia outlets for the products of combustion a apted to cause the products of combustion to flow under the annealing flow across the heating chamber and down one side of same, means for regulating the flow of products of combustion through the main outlet, spaced supports for the article to be heated extending a suitable distance above the hearth, an auxiliary outlet arranged intermediate the supports ,for the escape of products of combustion and means for regulating the flow of products of combustion through-the auxiliary outlet.

In testimony whereof, I have hereunto set my hand.

' GEORGE J. HAGAN. 

